Cover plate assembly and single cell

Abstract

The utility model provides a kind of cover plate assembly and single battery, the cover plate assembly includes cover plate, insulating sealing assembly and electrode terminal, cover plate and electrode terminal are connected by insulating sealing assembly;Cover plate includes cover plate body, cover plate body includes the first face and the second face being oppositely arranged along the first direction, cover plate body is provided with the mounting hole being penetrated along the first direction, at least part of electrode terminal is penetrated mounting hole, the ratio of the height of the first section extending in mounting hole and the height of mounting hole is 0-0.45, that is, the height of the first section extending in mounting hole is less than half of mounting hole height, so that the space remaining of mounting hole can be used for second section.In riveting electrode terminal, the part of second section between electrode terminal and second face is extruded deformation, its second section in the part of mounting hole can decompose its deformation pressure, to further reduce the pressure of the first section being extruded, avoid its cracking, increase the safety performance of single battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate assembly and a single battery cell. Background Technology

[0002] In the development of battery technology, besides improving the performance of individual cells, safety is also a crucial issue that cannot be ignored. If the safety of individual cells cannot be guaranteed, then those cells cannot be used. Therefore, how to enhance the safety of individual cells is a pressing technical problem that needs to be solved in battery technology. Utility Model Content

[0003] In view of this, the present invention aims to provide a cover plate assembly and a single battery cell to solve some or all of the aforementioned technical problems.

[0004] To achieve the above objectives, the first aspect of this utility model provides a cover plate assembly, comprising: a cover plate, an insulating sealing assembly, and electrode terminals, wherein the cover plate and the electrode terminals are connected through the insulating sealing assembly; The cover plate includes a cover plate body, the cover plate body includes a first surface and a second surface disposed opposite to each other along a first direction, the first direction being the thickness direction of the cover plate body; the cover plate body is provided with a mounting hole that passes through along the first direction, and the electrode terminal at least partially passes through the mounting hole; The insulating sealing assembly includes a first segment and a second segment, wherein the first segment is at least partially disposed between the electrode terminal and the first surface, and the second segment is at least partially disposed between the electrode terminal and the second surface; along the first direction, the ratio of the height H1 of the first segment extending in the mounting hole to the height H3 of the mounting hole is 0-0.45.

[0005] Optionally, the electrode terminal includes a fixing part, an electrode body, and an electrode base plate connected in sequence. The electrode body at least partially penetrates the mounting hole. The electrode base plate is located at one end of the mounting hole near the second surface. The fixing part is located at one end of the mounting hole near the first surface. When the second segment is in the first state, the second segment is spaced apart from the first segment. When the second segment is in the second state, the second segment is engaged with the first segment.

[0006] Optionally, the second segment includes a first part and a second part, wherein the first part is disposed between the pole base plate and the second surface, and the second part is disposed within the mounting hole; The first part and the second part are integrally formed.

[0007] Optionally, the ratio of H1 to H3 is not greater than 0.25.

[0008] Optionally, the second segment includes a first part and a second part, wherein the first part is disposed between the pole base plate and the second surface, and the second part is disposed within the mounting hole; the first part and the second part are separate structures.

[0009] Optionally, the first part is a first material, the second part is a second material, and the Shore hardness of the second material is greater than that of the first material.

[0010] Optionally, when the second segment is in the first state, a first gap is formed between the second segment and the first segment, the size of the first gap along the first direction is H2, and the ratio of H2 to the height of the mounting hole along the first direction is not greater than 0.12.

[0011] Optionally, the first surface is formed with an annular boss protruding in a direction away from the second surface, the annular boss being disposed around the outer periphery of the first segment; or, the first surface is formed with an annular groove recessed in a direction toward the second surface, the annular groove being disposed around the mounting hole, the first segment being partially disposed within the annular groove; the annular boss and the annular groove are used to define the first segment in a second direction, the second direction being perpendicular to the first direction.

[0012] Optionally, along the second direction, the maximum linear distance between the circumferential edge of the fixing part and the circumferential sidewall of the pole body is L1, the maximum linear distance between the circumferential edge of the second segment and the circumferential sidewall of the pole body is L2, the maximum linear distance between the circumferential edge of the pole base plate and the circumferential sidewall of the pole body is L3, and the second direction is perpendicular to the first direction. L1≤L2≤L3.

[0013] Based on the same inventive concept, the second aspect of this utility model also provides a single battery cell, including the cover assembly as described in the first aspect.

[0014] As can be seen from the above description, the cover plate assembly and single battery provided by this utility model include a cover plate, an insulating sealing assembly, and electrode terminals. The cover plate and the electrode terminals are connected by the insulating sealing assembly. The cover plate includes a cover plate body, which includes a first surface and a second surface arranged opposite to each other along a first direction. The cover plate body has a through mounting hole along the first direction. At least a portion of the electrode terminal passes through the mounting hole. The insulating sealing assembly includes a first segment and a second segment. At least a portion of the first segment is located between the electrode terminal and the first surface of the cover plate and extends into the mounting hole. At least a portion of the second segment is located between the electrode terminal and the second surface of the cover plate and extends into the mounting hole. The ratio of the height of the first segment extending into the mounting hole to the height of the mounting hole is 0-0.45, that is, the height of the first segment extending into the mounting hole is less than half the height of the mounting hole. In this way, the remaining space in the mounting hole can be used by the second segment, that is, the height of the second segment extending into the mounting hole is greater than the height of the first segment extending into the mounting hole. During the riveting of the electrode terminals, the second section located between the electrode terminal and the second surface is squeezed and deformed. The part of the second section located in the mounting hole can decompose the deformation pressure, thereby reducing the pressure of the first section being squeezed, preventing it from cracking, and increasing the safety performance of the single cell. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1A This is a structural diagram of a single battery cell in an embodiment of this utility model.

[0017] Figure 1B This is a partial cross-sectional schematic diagram of the cover plate assembly of the first structure in the embodiments of this utility model.

[0018] Figure 1C As an embodiment of this utility model Figure 1B Enlarged schematic diagram of part A.

[0019] Figure 1D This is an exploded view of the cover plate assembly of the first structure in the embodiments of this utility model.

[0020] Figure 2A This is a partial cross-sectional schematic diagram of the cover plate assembly of the second structure in the embodiments of this utility model.

[0021] Figure 2B As an embodiment of this utility model Figure 2AEnlarged schematic diagram of section B in the middle.

[0022] Figure 2C This is an exploded view of the cover plate assembly of the second structure in the embodiments of this utility model.

[0023] Figure 3A This is a cross-sectional view of the electrode terminal of one structure in the cover plate assembly of the second structure in this utility model embodiment before assembly.

[0024] Figure 3B This is a cross-sectional view of the electrode terminal of another structure in the cover plate assembly of the second structure in the present utility model embodiment before assembly.

[0025] Figure 4A This is a partial cross-sectional schematic diagram of the cover plate assembly of the third structure in the embodiments of this utility model.

[0026] Figure 4B As an embodiment of this utility model Figure 4A Enlarged schematic diagram of section C.

[0027] Figure 4C This is an exploded view of the cover plate assembly of the third structure in the embodiments of this utility model.

[0028] Figure 5A This is a partial cross-sectional schematic diagram of the cover plate assembly of the fourth structure in the embodiments of this utility model.

[0029] Figure 5B As an embodiment of this utility model Figure 5A Enlarged schematic diagram of section D in the middle.

[0030] Figure 5C This is an exploded view of the cover plate assembly of the fourth structure in the embodiments of this utility model.

[0031] Figure 6A This is a partial cross-sectional schematic diagram of the cover plate assembly of the fifth structure in the embodiments of this utility model.

[0032] Figure 6B As an embodiment of this utility model Figure 6A Enlarged schematic diagram of section E in the middle.

[0033] Figure 6C This is an exploded view of the cover plate assembly of the fifth structure in the embodiments of this utility model.

[0034] Explanation of reference numerals in the attached figures: 100. Cover plate; 110. Cover plate body; 1101. First surface; 1102. Second surface; 111. Annular boss; 112. Annular groove; 120. Mounting hole; 200. Insulation and sealing assembly; 210. First section; 211. Sealing body; 212. Positioning post; 220. Second paragraph; 221. First part; 222. Second part; 230. Third paragraph; 300, Electrode terminal; 310, Electrode post body; 320, Fixing part; 330, Electrode post base plate; 350, Annular protrusion; 400, Electrode assembly. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0036] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] Figure 1A A structural diagram of a single-cell battery is shown. As shown in Figure 1, the single-cell battery includes a cover plate 100 assembly and an electrode assembly 400, with the cover plate 100 assembly disposed on and connected to the electrode assembly 400.

[0038] Figure 1B A partial cross-sectional schematic diagram of the cover plate assembly of the first structure is shown. Figure 1C It shows Figure 1B Enlarged schematic diagram of part A. Figure 1D An exploded view of the cover plate 100 assembly of the first structure is shown.

[0039] like Figure 1B , Figure 1C and Figure 1D As shown, in some embodiments, the cover plate assembly includes a cover plate 100, an electrode terminal 300 connected to the cover plate 100, and an insulating sealing assembly 200 connected between the electrode terminal 300 and the cover plate 100. The cover plate 100 includes a cover plate body 110, the cover plate body 110 includes an inner wall facing the electrode assembly 400; the cover plate body 110 is provided with a mounting hole 120 that extends along a first direction, the first direction being the thickness direction of the cover plate body 110. The electrode terminal 300 includes an electrode post body 310, a fixing part 320, and an electrode post base plate 330. The electrode post body 310 is connected to the electrode post base plate 330. The electrode post base plate 330 is located at the end of the mounting hole 120 near the electrode assembly 400. The electrode post body 310 is at least partially inserted through the mounting hole 120, and the end of the electrode post body 310 away from the electrode assembly 400 extends out of the mounting hole 120. The fixing part 320 is located on the outer periphery of the end of the electrode post body 310 away from the electrode assembly 400, is integrally formed with the electrode post body 310, and extends radially along the electrode post body 310. The insulating sealing assembly 200 and the cover plate body 110 are at least partially clamped between the fixing part 320 and the electrode post base plate 330. The insulating sealing assembly 200 includes an upper insulating portion and a sealing ring. The upper insulating portion is at least partially located between the electrode terminal 300 and the cover plate body 110 and extends to the mounting hole 120. The sealing ring is at least partially located between the electrode terminal 300 and the cover plate body 110.

[0040] The applicant's research found that the flanged and riveted cover of a lithium battery typically consists of an upper plastic layer, a sealing ring, a light aluminum sheet, and a lower plastic layer along a first direction (as shown in the attached diagram). Figure 1B The electrode terminal 300 is formed by flanging and riveting. When flanging and riveting the electrode terminal 300, the fixing part 320 of the electrode terminal 300 applies pressure to the height direction of the electrode post body 310 (as shown in the z direction in the figure, which is also the first direction). The sealing ring will be squeezed and deformed. Part of the sealing ring will extend into the mounting hole 120 and squeeze the part of the upper insulating part located in the mounting hole 120. As a result, the pressure applied to the upper insulating part will cause the upper insulating part to crack, which seriously affects the lithium battery forming yield and reduces the safety of the single cell.

[0041] Figure 2A A partial cross-sectional schematic diagram of the cover plate 100 assembly with the second structure is shown. Figure 2B It shows Figure 2A Enlarged diagram of section B in the middle. Figure 2C An exploded view of the cover plate 100 assembly of the second structure is shown.

[0042] To solve the above technical problems, such as Figure 2A , Figure 2B and Figure 2CAs shown, this utility model provides a cover plate 100 assembly, including a cover plate 100, an insulating sealing assembly 200, and an electrode terminal 300. The cover plate 100 includes a cover plate body 110, which includes a first surface 1101 and a second surface 1102 disposed opposite to each other along a first direction, the first direction being the thickness direction of the cover plate body 110. The cover plate body 110 is provided with a mounting hole 120 that extends through along the first direction, and the electrode terminal 300 at least partially penetrates the mounting hole 120. The insulating sealing assembly 200 includes a first segment 210 and a second segment 220, the first segment 210 being at least partially disposed between the electrode terminal 300 and the first surface 1101, and the second segment 220 being at least partially disposed between the electrode terminal 300 and the second surface 1102. Along the first direction, the ratio of the height H1 of the first segment 210 extending in the mounting hole 120 to the thickness H3 of the mounting hole 120 is 0-0.45.

[0043] For example, electrode terminal 300 is connected to electrode assembly 400, and the tabs of electrode assembly 400 can be directly electrically connected to electrode base plate 330, or the tabs of electrode assembly 400 can be electrically connected to electrode base plate 330 through adapter.

[0044] For example, the first segment 210 of the insulating sealing assembly 200 is an upper insulating member, and the second segment 220 of the insulating sealing member is a sealing member. In this embodiment, since the second segment 220 is partially disposed between the electrode terminal 300 and the second surface 1102, the other part of the second segment 220 is disposed within the mounting hole 120, that is, the cross-section of the sealing ring is an L-shaped cross-section. When the electrode terminal 300 is riveted, a portion of the electrode terminal 300 will be squeezed along the first direction, causing the sealing ring located between the electrode terminal 300 and the second surface 1102 to deform and thus achieve the sealing function. The portion of the sealing ring located within the mounting hole 120 will decompose the deformation pressure and extend upward into the plastic to fit against the first segment 210. The sealing ring located within the mounting hole 120 decomposes the deformation pressure of the portion of the sealing ring located between the electrode terminal 300 and the second surface 1102, avoiding cracking of the first segment 210, that is, avoiding the problem of cracking of the upper plastic, and enhancing the safety of the single battery cell.

[0045] It should be noted that the ratio of the height H1 of the first segment 210 extending into the mounting hole 120 to the height H3 of the mounting hole 120 is 0-0.45. The height of the mounting hole 120 refers to the height of the wall of the cover plate body forming the mounting hole 120 along the first direction. That is, the height of the first segment 210 extending into the mounting hole 120 is less than half the height of the mounting hole 120. In this way, the space left for the second segment 220 to extend into the mounting hole 120 is greater than the portion of the first segment 210 within the mounting hole 120. This allows the portion of the second segment 220 extending into the mounting hole 120 to have greater deformation or movement space, which can distribute greater compressive pressure and prevent the deformation pressure of the second segment 220 from pressing onto the first segment 210, thus avoiding the problem of the first segment 210 cracking.

[0046] Continue to refer to Figure 2A , Figure 2B and Figure 2C In some embodiments, the electrode terminal 300 includes a fixing part 320, an electrode body 310, and an electrode base plate 330 connected in sequence. The electrode body 310 at least partially penetrates the mounting hole 120. The electrode base plate 330 is located at one end of the mounting hole 120 near the second surface 1102. The fixing part 320 is located at one end of the mounting hole 120 near the first surface 1101. When the second segment 220 is in the first state, the second segment 220 is spaced apart from the first segment 210. When the second segment 220 is in the second state, the second segment 220 is engaged with the first segment 210.

[0047] For example, the state of the second segment 220 can be whether the second segment 220 is in a compressed state. The first state is that the second segment 220 is not compressed, and the second state is that the second segment 220 is compressed.

[0048] For example, Figure 3A A cross-sectional view of one structure of the electrode terminal 300 in the second type of cover plate 100 assembly before assembly is shown. Figure 3A As shown, the cover plate 100 assembly is assembled using a flanged riveting method. Before assembly, an annular protrusion 350 can be formed on the top edge of the electrode body 310, allowing the electrode base plate 330 to be fixedly connected to the electrode body 310. When assembling the cover plate 100 assembly, the second segment 220 can be connected to the electrode terminal 300 first. At this point, only the second segment 220 is fitted onto the electrode body 310, and the second segment 220 remains in its original state, i.e., not compressed. Then, the annular protrusion 350 is moved radially towards the electrode body 310 (e.g., ...). Figure 3BThe second segment 220 is bent until it engages with the pole base plate 330 to clamp the cover plate body 110 and the insulating sealing assembly 200. At this time, the bent annular protrusion 350 forms a fixing part 320. When the fixing part 320 engages with the pole base plate 330 to clamp the cover plate body 110 and the insulating sealing assembly 200, the second segment 220 is in a compressed state.

[0049] For example, the fixing part 320 based on the above embodiment is connected to the pole body 310. The fixing part 320 can also be connected to the pole body 310 by means of welding, threaded connection, riveting, bonding or integral molding structure.

[0050] It should be noted that when the fixing part 320 and the pole post base plate 330 clamp the cover plate body 110 and the insulating sealing assembly 200, the second segment 220 is in a compressed state. Since the fixing part 320 and the pole post base plate 330 clamp the cover plate body 110, that is, the fixing part 320 applies pressure in the first direction, the part of the second segment 220 located between the second surface 1102 of the cover plate body 110 and the pole post base plate 330 is compressed and deformed, thereby causing the part of the second segment 220 located in the mounting hole 120 to shift or slightly deform, so that the second segment 220 engages with the first segment 210. The pressure of the part of the second segment 220 located in the mounting hole 120 is distributed by the part of the second segment 220 located between the second surface 1102 of the cover plate body 110 and the pole post base plate 330, thereby solving the problem of the upper plastic being deformed due to the deformation of the sealing ring.

[0051] Continue to refer to Figure 2A , Figure 2B and Figure 2C In some embodiments, the second segment 220 includes a first part 221 and a second part 222. The first part 221 is disposed between the pole base plate 330 and the second surface 1102 and extends to the connection between the pole body 310 and the pole base plate 330. The second part 222 is disposed in the mounting hole 120. The first part 221 and the second part 222 are integrally formed.

[0052] For example, the second segment 220 can be a sealing ring, the cross-sectional shape of which along the Z direction is L-shaped, and the sealing ring is located in the first direction (see...). Figure 2B The portion in the z-direction (i.e., the second portion 222) extends into the mounting hole 120, and the sealing ring is located in the second direction (see...). Figure 2BThe portion (i.e., the first part 221) in the x-direction is located between the second surface 1102 of the cover plate body 110 and the pole base plate 330. The first part 221 and the second part 222 of the second segment 220 can be manufactured using a molding process. Rubber raw material is placed in the mold, and the rubber is vulcanized and molded by heating and pressurizing to finally obtain the sealing ring of the desired shape. Alternatively, an injection molding process can be used, where a silicone injection molding machine injects the rubber material into the mold cavity, and the rubber is rapidly vulcanized and molded under high pressure.

[0053] Figure 4A A partial cross-sectional schematic diagram of the cover plate 100 assembly with the third structure is shown. Figure 4B It shows Figure 4A Enlarged diagram of section C in the middle. Figure 4C An exploded view of the cover plate 100 assembly of the third structure is shown.

[0054] Reference Figure 4A , Figure 4B and Figure 4C In some embodiments, the first part 221 and the second part 222 are separate structures.

[0055] It should be noted that the first part 221 is the portion where the sealing ring is arranged along the first direction, and the second part 222 is the portion where the sealing ring is arranged along the second direction. Based on the above embodiment, the fixing part 320 and the electrode base plate 330 clamp the cover plate body 110, that is, the fixing part 320 applies pressure in the first direction, so the first part 221 is squeezed and deformed. The first part 221 will transmit the squeezing pressure to the second part 222 for pressure decomposition, so as to achieve a smaller pressure or zero pressure squeezing of the first section 210 (that is, the upper plastic), solving the problem of upper plastic cracking and enhancing the safety of the single battery. In this embodiment, by setting the first part 221 and the second part 222 as separate structures, during the assembly of the cover plate 100 assembly, the first part and the second part are respectively fitted onto the electrode body. After assembly, after the first part 221 is squeezed and deformed, some of the extrusion pressure will be applied to the second part 222. Then the second part 222 can decompose the extrusion pressure through displacement, solving the problem of plastic cracking. After displacement, the second part 222 joins with the first section 210, and at the same time achieves the function of insulation, enhancing the safety of the single battery.

[0056] Reference Figure 4A , Figure 4B and Figure 4C In some embodiments, the first part 221 is a first material, the second part 222 is a second material, and the Shore hardness of the second material is greater than that of the first material.

[0057] For example, the first material can be a rubber material (e.g., silicone rubber, nitrile rubber, neoprene rubber, fluororubber), and the hardness of the first material can be 70±10 Shore. The second material can be polyurethane rubber, polypropylene, synthetic rubber, etc., with a Shore hardness greater than that of the first material.

[0058] It should be noted that the first part 221 and the second part 222 are made of different materials, and the hardness of the second material is greater than that of the first material. During the assembly of the cover plate 100, after the first part 221 is squeezed and deformed, some of the extrusion pressure will be applied to the second part 222. The fact that the hardness of the second material of the second part 222 is greater than that of the first material can reduce or offset the deformation of the first part 221, thereby reducing the displacement or deformation of the second part 222, reducing the pressure exerted by the second part 222 on the first section 210, avoiding the problem of cracking of the first section 210, and enhancing the safety of the single cell.

[0059] Reference Figure 2B or Figure 4B The first segment 210 extends into the mounting hole 120 to form a positioning post 212, and the dimension of the positioning post 212 along the first direction is H1; the thickness of the portion of the cover plate body 110 adjacent to the mounting hole 120 (i.e. the height of the mounting hole) is H3, and the ratio of H1 to H3 is preferably not greater than 0.25.

[0060] For example, H1 can be 0.1mm, 0.2mm, or 0.3mm, and H3 can be 0.4mm, 0.5mm, or 0.6mm; ensuring that the height of the positioning post 212 is within the range of 0 ≤ H1 ≤ 0.3mm. When the ratio of H1 to H3 is not greater than 0.25, it can be ensured that the height of the second part 222 along the z-direction is sufficient, thereby ensuring that the force along the z-direction of the first part after compression can be fully distributed, reducing the thrust of the second part 220 along the z-direction on the first segment 210, and reducing the risk of cracking of the first segment 210. No specific limitations are made in this utility model; the setting is based on the actual situation.

[0061] Figure 5A A partial cross-sectional schematic diagram of the cover plate 100 assembly with the fourth structure is shown. Figure 5B It shows Figure 5A Enlarged diagram of section D in the middle. Figure 5C An exploded view of the cover plate 100 assembly of the fourth structure is shown.

[0062] like Figure 5A , Figure 5B and Figure 5C As shown, the first surface 1101 is formed with an annular boss 111 protruding in a direction away from the second surface 1102. The annular boss 111 is arranged around the outer periphery of the first segment 210. The annular boss 111 is used to define the first segment 210 in a second direction, which is perpendicular to the first direction.

[0063] For example, the annular boss 111 can be integrally formed with the cover plate body 110, or it can be an annular boss 111 formed by welding an annular component onto the cover plate body 110. When the annular boss 111 and the cover plate body 110 are integrally formed, the connection between the two is more reliable. On the other hand, it can also reduce the manufacturing difficulty of the cover plate 100, reduce the manufacturing cost, and facilitate mass production.

[0064] Specifically, the annular boss 111 protrudes in a direction away from the second surface 1102, thus forming a limiting space with the first surface 1101 of the cover body 110. The first segment 210 (i.e., the upper plastic) is set within the limiting space, meaning the annular boss 111 surrounds the outer periphery of the first segment 210. The annular boss 111 effectively limits the positioning of the first segment 210, preventing inaccurate alignment due to displacement of the first segment 210 during the assembly of the cover 100 assembly, and avoiding cracking of the first segment 210 when the fixing part 320 presses it. By limiting the first segment 210 within the annular boss 111, accurate alignment during the assembly of the cover 100 assembly can be ensured, improving assembly speed.

[0065] Figure 6A A partial cross-sectional schematic diagram of the cover plate 100 assembly of the fifth structure is shown. Figure 6B It shows Figure 6A Enlarged diagram of section E in the middle. Figure 6C An exploded view of the cover plate 100 assembly of the fifth structure is shown.

[0066] like Figure 6A , Figure 6B and Figure 6C As shown, the first surface 1101 is formed with an annular groove 112 recessed in the direction toward the second surface 1102. The annular groove 112 is disposed around the mounting hole 120. The first segment 210 is partially disposed in the annular groove 112. The annular groove 112 is used to define the first segment 210 in a second direction, which is perpendicular to the first direction.

[0067] For example, the annular groove 112 can be formed by extruding or bending the cover plate body 110. The annular groove 112 and the cover plate body 110 are integrally formed structures, which have higher connection reliability. On the other hand, it can also reduce the manufacturing difficulty of the cover plate 100, reduce the manufacturing cost, and facilitate mass production.

[0068] Specifically, the annular groove 112 protrudes in a direction away from the second surface 1102, thus forming a limiting space with the first surface 1101 of the cover plate body 110. The first segment 210 (i.e., the upper plastic) is set within the limiting space, meaning the annular groove 112 surrounds the outer periphery of the first segment 210. The annular groove 112 effectively limits the positioning of the first segment 210, preventing inaccurate alignment due to displacement of the first segment 210 during the assembly of the cover plate 100 assembly, and avoiding cracking of the first segment 210 when the fixing part 320 presses it. By limiting the first segment 210 within the annular groove 112, accurate alignment during the assembly of the cover plate 100 assembly can be ensured, improving assembly speed.

[0069] Reference Figure 2B , Figure 4B , Figure 5B or Figure 6B When the second segment 220 is in the first state, a first gap is formed between the second part 222 and the first segment 210. The size of the first gap along the first direction is H2, and the ratio of H2 to the height of the mounting hole 120 along the first direction is not greater than 0.12.

[0070] It should be noted that the thickness of the portion of the cover plate body 110 adjacent to the mounting hole 120 is the same as the height of the mounting hole 120 along the first direction, that is, the height of the mounting hole 120 along the first direction is H3, then the ratio of H2 to H3 is not greater than 0.12.

[0071] For example, the size range of the first gap along the first direction can be 0≤H2≤0.1mm. In this utility model, the range of the first gap is not specifically limited and can be set according to the actual situation.

[0072] It should be noted that the first gap is the gap between the sealing ring and the upper plastic when the cover plate 100 assembly is not assembled, that is, the state in which the fixing part 320 does not compress the first section 210, the second section 220 and the cover plate body 110. The first gap is set between the second section 220 and the first section 210 so that the first part 221 of the second section 220 can be deformed and compress the second part 222. The second part 222 can be deformed or displaced in the first gap. The first gap can ensure that the second part 222 has enough space to decompose the compression pressure, eliminate or reduce the compression pressure of the second section 220 on the first section 210, solve the problem of cracking of the upper plastic caused by the sealing ring compressing the upper plastic, and enhance the safety of the single battery.

[0073] Reference Figure 2B , Figure 4B , Figure 5B or Figure 6BThe insulating sealing assembly 200 also includes a third section 230, which is located between the cover plate body 110 and the pole base plate 330. The third section 230 and the first part 221 of the second section 220 have a sealing gap.

[0074] by Figure 2B Taking the structure and orientation shown as an example, the cover plate body 110 and the pole post base plate 330 are spaced apart along the first direction and form a sealing gap H4 between them.

[0075] Regarding the sealing gap on the left side of the electrode post body 310, under the compression of the electrode post base plate 330 and the cover plate body 110, both the third segment 230 and the second segment 220 within the sealing gap H4 can achieve a sealing effect. The sealing gap extends from the left end of the sealing gap H4 to the right, while the second segment 220 extends from the right end of the sealing gap H4 to the left. When the third segment 230 and the second segment 220 are engaged, the sealing gap H4 can form a complete sealing structure from the left end to the right end, which can further improve the sealing effect of the single cell and prevent the electrolyte inside the single cell from leaking out.

[0076] Reference Figure 2B , Figure 4B , Figure 5B or Figure 6B Along the second direction, the maximum linear distance between the circumferential edge of the fixing part 320 and the circumferential sidewall of the pole body 310 is L1, the maximum linear distance between the circumferential edge of the second segment 220 after assembly compression and the circumferential sidewall of the pole body 310 is L2, and the maximum linear distance between the circumferential edge of the pole base plate 330 and the circumferential sidewall of the pole body 310 is L3. The second direction is perpendicular to the first direction. L1≤L2≤L3.

[0077] For example, in the range L1≤L2≤L3, L1<L2<L3 takes precedence.

[0078] It should be noted that the second direction is supplementary. Figure 2B , Figure 4B , Figure 5B or Figure 6BIn the X direction, during the assembly of the cover plate 100 assembly, the fixing part 320 compresses the first segment 210, the cover plate body 110, and the second segment 220. During this compression, the second segment 220 deforms and shifts. When the second segment 220 is compressed, its second part 222 engages with the first segment 210, and its first part 221 engages with the third segment 230, achieving a seal. When L1 < L2 < L3, that is, the end of the first part 221 of the second segment 220 facing the third segment 230 protrudes along the second direction relative to the moving circumferential edge of the fixing part 320, and the edge of the third segment 230 facing the second direction protrudes relative to the edge of the first part 221 of the second segment 220. Thus, the fixing part 320, the second segment 220, and the third segment 230 form a stepped seal, resulting in a better sealing effect.

[0079] Based on the same inventive concept and in conjunction with the description of the cover plate assembly in the above embodiments, this embodiment provides a single battery cell that has the corresponding technical effects of the cover plate assembly in the above embodiments, which will not be repeated here.

[0080] A single-cell battery includes a cover assembly as described in the various embodiments above.

[0081] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0082] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0083] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0084] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0085] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0086] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate, the insulating sealing assembly, and the electrode terminals are connected by the insulating sealing assembly. The cover plate includes a cover plate body, the cover plate body includes a first surface and a second surface disposed opposite to each other along a first direction, the first direction being the thickness direction of the cover plate body; the cover plate body is provided with a mounting hole that passes through along the first direction, and the electrode terminal at least partially passes through the mounting hole; The insulating sealing assembly includes a first segment and a second segment, wherein the first segment is at least partially disposed between the electrode terminal and the first surface, and the second segment is at least partially disposed between the electrode terminal and the second surface; along the first direction, the ratio of the height H1 of the first segment extending in the mounting hole to the height H3 of the mounting hole is 0-0.

45.

2. The cover plate assembly according to claim 1, characterized in that, The electrode terminal includes a fixing part, an electrode body, and an electrode base plate connected in sequence. The electrode body at least partially penetrates the mounting hole. The electrode base plate is located at one end of the mounting hole near the second surface. The fixing part is located at one end of the mounting hole near the first surface. When the second segment is in the first state, the second segment is spaced apart from the first segment. When the second segment is in the second state, the second segment is engaged with the first segment.

3. The cover plate assembly according to claim 2, characterized in that, The second segment includes a first part and a second part, wherein the first part is disposed between the pole base plate and the second surface, and the second part is disposed within the mounting hole; The first part and the second part are integrally formed.

4. The cover plate assembly according to claim 2, characterized in that, The second segment includes a first part and a second part. The first part is disposed between the pole base plate and the second surface, and the second part is disposed in the mounting hole. The first part and the second part are separate structures.

5. The cover plate assembly according to claim 4, characterized in that, The first part is made of a first material, the second part is made of a second material, and the Shore hardness of the second material is greater than that of the first material.

6. The cover plate assembly according to claim 3, characterized in that, When the second segment is in the first state, a first gap is formed between the second segment and the first segment. The size of the first gap along the first direction is H2, and the ratio of H2 to the height of the mounting hole along the first direction is not greater than 0.

12.

7. The cover plate assembly according to claim 1, characterized in that, The ratio of H1 to H3 is no greater than 0.

25.

8. The cover plate assembly according to claim 1, characterized in that, The first surface is formed with an annular boss protruding in a direction away from the second surface, the annular boss being disposed around the outer periphery of the first segment; or, the first surface is formed with an annular groove recessed in a direction toward the second surface, the annular groove being disposed around the mounting hole, the first segment being partially disposed within the annular groove; the annular boss and the annular groove are used to define the first segment in a second direction, the second direction being perpendicular to the first direction.

9. The cover plate assembly according to claim 2, characterized in that, Along the second direction, the maximum linear distance between the circumferential edge of the fixing part and the circumferential sidewall of the pole body is L1, the maximum linear distance between the circumferential edge of the second segment and the circumferential sidewall of the pole body is L2, the maximum linear distance between the circumferential edge of the pole base plate and the circumferential sidewall of the pole body is L3, and the second direction is perpendicular to the first direction. L1≤L2≤L3.

10. A single-cell battery, characterized in that, Includes the cover plate assembly as described in any one of claims 1-9.

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